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WO1994004690A1 - Immunoadhesines bispecifiques - Google Patents

Immunoadhesines bispecifiques Download PDF

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Publication number
WO1994004690A1
WO1994004690A1 PCT/US1993/007783 US9307783W WO9404690A1 WO 1994004690 A1 WO1994004690 A1 WO 1994004690A1 US 9307783 W US9307783 W US 9307783W WO 9404690 A1 WO9404690 A1 WO 9404690A1
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Prior art keywords
light chain
immunoglobulin
antibody
bispecific
igg
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WO1994004690A9 (fr
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Avi J. Ashkenazi
Steven M. Chamow
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Genentech Inc
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Genentech Inc
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Priority to JP6506516A priority Critical patent/JPH08500017A/ja
Priority to DE69308573T priority patent/DE69308573T2/de
Priority to EP93920182A priority patent/EP0656064B1/fr
Priority to AU50801/93A priority patent/AU668423B2/en
Publication of WO1994004690A1 publication Critical patent/WO1994004690A1/fr
Publication of WO1994004690A9 publication Critical patent/WO1994004690A9/fr
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/46—Hybrid immunoglobulins
    • C07K16/468—Immunoglobulins having two or more different antigen binding sites, e.g. multifunctional antibodies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
    • C07K14/70503—Immunoglobulin superfamily
    • C07K14/70514—CD4
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/2803—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily
    • C07K16/2809—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily against the T-cell receptor (TcR)-CD3 complex

Definitions

  • the present invention is from the field of bispecific immunoadhesins. More specifically, this invention relates to the use of recombinant techniques to produce immunoadhesins with dual specificity and to techniques for their purification to homogeneity. The invention also concerns bispecific immunoadhesins for therapeutic or diagnostic use.
  • Immunoadhesins are antibody-like molecules which combine the binding specificity of a protein such as a cell-surface receptor, a cell-adhesion molecule or a ligand (an "adhesin"), with the effector functions of immunoglobulin constant domains.
  • Immunoadhesins can possess many of the valuable chemical and biological properties of human antibodies. Since immunoadhesins can be constructed from a human protein sequence with a desired specificity linked to an appropriate human immunoglobulin hinge and constant domain (Fc) sequence, the binding specificity of interest can be achieved using entirely human components. Such immunoadhesins are minimally immunogenic to the patient, and are safe for chronic or repeated use. If the two arms of the antibody-like immunoadhesin structure have two different specificities, the immunoadhesin is referred to as bispecific on the analogy of bispecific antibodies.
  • Immunoadhesins reported in the literature include fusions of the T cell receptor * [Gascoigne et al . , Proc. Natl.Acad. Sci. USA 84, 2936-2940 (1987)]; CD4 * [Capon et al . , Nature 337, 525-531 (1989); Traunecker et al . , Nature 339, 68-70 (1989); Zettmeissl et al . , DNA Cell Biol. USA 9_, 347-353 (1990); Byrn et al . , Nature 344. 667-670 (1990)]; L-selectin (homing receptor) [Watson et al . , J. Cell.
  • receptor-immunoglobulin immunoadhesins A prototype of receptor-immunoglobulin immunoadhesins is the CD4-IgG chimera, which has been extensively studied in clinical trials to investigate its ability to prevent or treat human immunodeficiency virus (HIV) infections.
  • HIV human immunodeficiency virus
  • Cytotoxic cells fall into three main categories; mediators of antibody-dependent cellular cytotoxicity (ADCC) , cytotoxic T lymphocytes (CTL) , and promiscuous killer cells ⁇ including natural killer (NK) cells and activated macrophages [Henkart, P.A., Ann. Rev. Immunol. 3_:31-58 (1985)] .
  • T cell receptor In T cell-mediated lysis, the T cell receptor (TCR) binds to altered or foreign markers in association with class II major histocompatibility complex (MHC) molecules on tumor or infected cell surfaces to distinguish these cells from normal autologous cells. In ADCC, this function is carried out by Fc ⁇ receptor (FC ⁇ R) to destroy the antibody coated target cell [Lovchik, J.C. and Hong, R., Prog. Allergy 22, 1-44
  • the normal immune responses to a foreign antigen include antigen processing and presenting by macrophages, monocytes and dendritic cells, T helper and memory cell regulation and the activation of these effector cells.
  • CD4+ T helper cells play a central role in the normal cascade of immune system responses by producing lymphokines to stimulate B cell, evoking the humoral immunity response leading to ADCC, and by stimulating activation of cytotoxic T lymphocytes, thereby recruiting the cellular immune response to foreign pathogens.
  • the latter is thought to be a major host defense against virus infection [Yap, K.L., et al . , Nature 273;238-239 (1978); Kannagi, M.
  • the cell surface protein CD4 was shown to be the receptor for the human immunodeficiency virus, HIV [reviewed in Capon and Ward, Annu. Rev. Immunol. S_, 649-678 (1991)].
  • Truncation of the native CD4 gene to remove sequences which encode the transmembrane and cytoplasmic domains enables the production of a recombinant soluble, secreted protein. It was suggested by several groups that recombinant soluble CD4 (rsCD4) might prevent HIV infection by blocking the virus-receptor interaction. However, it soon became clear that, due to their small size, the half-lives of soluble, secreted forms of the CD4 antigen were short as molecules of this size (about 50 kDa) are swiftly cleared by the kidney.
  • CD4- IgG can mediate ADCC of HIV-infected cells to the same extent as polyclonal anti-HIV sera.
  • anti-HIV antisera can also mediate ADCC on "bystander" cells sensitized by the presence of soluble gpl20, this is not the case for CD4-IgG, since soluble gpl20 has only one CD4- binding site.
  • CD4-IgG was transferred across the primate placenta with a rate of 1% per 8 hours, comparable to that observed for human IgG in human subjects.
  • CD4-IgG crossed the human placenta to the same extent as IgG does. Neither the mothers nor their infants showed any sign of toxicity. During the follow-up time none of the infants has shown evidence of HIV infection, as determined through PCR, plasma viral cultures, and lymphocyte proliferation. It is known that although AIDS patients lose HIV-specific cytotoxic T cells, their remaining CD8-positive T lymphocytes maintain cytotoxic function.
  • Cytotoxic T lymphocytes may be the last survivors of the disasterous failure of the immune system due to HIV infection, with their function retained [Walker, B.D., Nature 328 :345-348 (1986)] although not activated or targeted to virus. Therefore, a rational approach to recruiting the immune system may be to exploit this remaining cellular immunity function through retargeting in the combat with virus.
  • bispecific antibodies capable of retargeting effector cells against virus infected cells were made. Because they express integral viral proteins on the surface, cells infected by retroviruses have been proposed to be particularly suitable for the bispecific antibody approach. With one arm recognizing a foreign antigen on the surface of a target cell and with the other arm recognizing an activation molecule on the surface of cytotoxic cells, such antibody-like molecules are able to activate the effector cells through their signal transduction systems, and help to deliver a lethal hit to the target cell even without the participation of the MHC system
  • bispecific antibody-like molecule (bispecific immunoadhesin with the terminology used herein) comprising a heavy chain/light chain pair from a mouse antibody to human CD3, linked to a human IgG heavy chain whose variable region has been replaced with a CD4 sequence, plus a second light chain.
  • CD3 is part of the antigen receptor on T cells and is responsible for signal transduction.
  • the bispecific molecule was designed to combine the ability of CD4 to bind to the gpl20 of any HIV strain with the T-cell activation property of antibodies to CD3.
  • bispecific antibodies and immunoadhesins are usually based on the coexpression of two immunoglobulin heavy chain-light chain pairs, where the two heavy chains have different. specificities [Milstein and Cuello, Nature 305. 537-539
  • the mouse bispecific immunoadhesin of Berg et al . was made on the analogy of bispecific antibodies, by cloning the gene encoding the chimeric protein CD4 2 ⁇ l (Capon et al . , supra) into a vector that allows expression in mouse cells and transfecting the vector obtained into a hybridoma secreting a ⁇ l, anti-human CD3 antibody.
  • CD4 2 ⁇ l retains the CHI domain of an immunoglobulin, it has the ability to bind an antibody light chain.
  • the transfectoma produced a heterogeneous product mixture, including the desired product which is a tetramer consisting of CD4 2 ⁇ l disulfide-bonded to an anti-CD3 antibody light chain linked to an anti-CD3 antibody heavy chain-light chain pair ( Figure 1 of Berg et al . ) .
  • Other combinations of the three polypeptide chains present in the transfectoma included two bivalent monospecific tetramers consisting of two disulfide- linked CD4 2 ⁇ l-anti-CD3 antibody light chain pairs (bivalent monospecific immunoadhesin) , and two disulfide-linked anti- CD3 antibody heavy chain-light chain pairs (bivalent anti-CD3 antibody) , respectively.
  • the CD4-region containing products were separated from the bivalent anti-CD3 antibodies by anti- CD4 affinity chromatography using an unidentified anti-CD4 monoclonal antibody for elution.
  • Figure 2E of Berg et al . roughly equal portions of the desired bifunctional immunoadhesin, and a tetramer of two bivalent monofunctional disulfide-linked CD4 2 ⁇ l-anti-CD3 antibody light chain pairs were obtained.
  • bispecific immunoadhesin preparations tested for efficacy in promoting the killing of HIV-infected cells in vi tro contained an equal amount of monospecific bivalent CD4 2 ⁇ l, tetramers (which do not promote cell killing) and the desired, active bispecific immunoadhesin.
  • the difficulty of purification lies in the small quantities and in the structural similarity of the two components, both having antibody-like, tetrameric structures consisting of two disulfide-bonded heavy chain-light chain pairs.
  • FvCD3 was then used to replace the variable domains in a human IgG3 molecule, and the obtained immunoadhesin (FvCD3- H ⁇ 3) was coexpressed with CD4-H ⁇ 3 in mammalian cells.
  • Three major products (CD4-H ⁇ 3, FvCD3-H ⁇ 3, and CD4-H ⁇ 3/FvCD3-H ⁇ 3) were obtained, of which the last mentioned bispecific immunoadhesin was a minor component which was not purified.
  • the invention relates to a novel method for making and purifying bispecific immunoadhesins. Based upon research with antibodies, it is generally believed that the presence of light chain is essential for efficient secretion of immunoadhesins (see, e.g. Berg et al . , supra) . Most bispecific immunoadhesins known in the art have been designed to have a light chain associated with a heavy chain fusion protein in each arm of the molecule. In the rare instances when the light chain is absent (see U.S. patent No. 5,116,964 issued 26 May 1992) the bispecific immunoadhesin has a symmetrical structure to ensure proper assembly and folding of the hybrid immunoglobulin chains.
  • the present invention takes advantage of the experimental finding that bispecific immunoadhesins composed of a hybrid immunoglobulin heavy chain in one arm and a hybrid immunoglobulin heavy chain-light chain pair in the other arm can be efficiently secreted in the form of correctly assembled and folded heterotrimers. This is notwithstanding the absence of the light chain in one arm, and the asymmetric structure of the trimeric molecule. It was further found that the same asymmetric structure that is not a detriment in the preparation process, facilitates the separation of the desired bispecific compound from unwanted immunoglobulin chain combinations, as the presence of an immunoglobulin light chain in only one half of the bispecific molecule provides for a facile way of separation.
  • the bispecific immunoadhesins of the invention are preferably produced by individually introducing into suitable host cells the DNA sequences encoding the three immunoglobulin chains making up the trimeric molecule.
  • the ratios of these DNA sequences can be freely changed.
  • the ratio in which the DNA sequences encoding the three chains of a heterotrimeric bispecific immunoadhesin are introduced into a recombinant host cell has a genuine effect on the composition of the product mixture obtained by their expression. More specifically, the mutual proportions of the three possible immunoglobulin chain combinations have been found to vary significantly as a function of the ratio of the plasmid DNAs used for transfection. Accordingly, by proper adjustment of the ratios of the DNA sequences encoding the two individual hybrid immunoglobulin heavy chains and the light chain the yield of any desired bispecific immunoadhesin product can be optimized.
  • the advantages of the preparation and purification processes of the present invention over the traditional approach are best illustrated when compared to the purification scheme of the construct of Berg et al . , supra.
  • the bispecific immunoadhesin of Berg et al . is composed of a mouse anti-human CD3 antibody heavy chain-light chain pair, disulfide linked to a CD4-IgG-l heavy chain constant domain- mouse anti-human CD3 antibody light chain pair.
  • both arms of the bispecific antibody-like molecule comprise an antibody light chain disulfide linked to an immunoglobulin CHI domain.
  • the coexpression results in three major products: the bispecific immunoadhesin, a bivalent monospecific tetramer composed of two disulfide linked anti- CD3-antibody heavy chain-light chain pairs, and a second bivalent monospecific tetramer composed of two disulfide linked CD4-IgG-l heavy chain-anti-CD3 light chain pairs.
  • the CD4 sequence-containing products can be separated from the anti-CD3 antibody molecule by purification techniques based on the CD4 portion of the molecules, their separation from one another has not been accomplished, primarily due to the unavailability of reagents capable of selective binding to the anti-CD3 portion of the bispecific immunoadhesin molecule.
  • Berg et a end up with a product mixture not suitable for any commercial (therapeutic or diagnostic) application.
  • the bispecific immunoadhesin structure of the present invention is composed of a humanized anti-CD3 antibody heavy chain-light chain pair, disulfide linked to a single CD4-IgG-l heavy chain constant domain fusion protein from which the CHI domain has been eliminated to avoid the binding of a light chain to this arm of the molecule.
  • the coding sequences of the three chains present in this structure were individually introduced into an appropriate host cell, thus providing for greater flexibility in adjusting their mutual proportions, and consequently resulting in markedly higher product yields than previously achieved.
  • the bispecific immunoadhesin can be separated from the undesired chain combinations in substantially homogenous form, enabling its therapeutic use.
  • the present invention relates to a method of making a bispecific immunoadhesin comprising: a) introducing into a host cell DNA sequences encoding a first fusion comprising a first binding domain fused to an immunoglobulin heavy chain constant domain sequence lacking a light chain binding site; a second fusion comprising a second binding domain fused to an immunoglobulin heavy chain constant domain sequence retaining a light chain binding site; and an immunoglobulin light chain, respectively; b) culturing the host cells so as to express the DNA sequences to produce a mixture of (i) a heterotrimer comprising the first fusion covalently linked with a second fusion-immunoglobulin light chain pair; (ii) a heterotetramer comprising two covalently-linked second fusion-immunoglobulin light chain pairs; and (iii) a homodimer comprising two covalently-linked molecules of the first fusion; c) removing the mixture of products (i)
  • At least two of the immunoglobulin chain-encoding DNA sequences are introduced into the host cells individually, and the yield of the desired heterotrimer is optimized by adjusting the ratios of these DNA sequences.
  • the invention concerns a method for isolating a bispecific immunoadhesin from the foregoing product mixture by utilizing methods specifically recognizing and separating, in optional order, the first binding domain- and the immunoglobulin light chain-containing products.
  • the preferred method for isolation is chromatography, and in particular, immunoaffinity chromatography, based on the first binding domain (i.e. the CD4 portion) , and on the immunoglobulin light chain portion of the bispecific immunoadhesin molecule.
  • the invention relates to a method for making a substantially homogeneous bispecific immunoadhesin with one arm specifically recognizing a foreign antigen on a target cell, and with the other arm an activation molecule on a cytotoxic cell, comprising: a) introducing into host cells DNA sequences encoding a fusion of a foreign antigen binding domain with an immunoglobulin heavy chain constant domain sequence in which the first immunoglobulin heavy chain constant domain (CHI) has been removed or modified such that it is _no longer capable of binding an immunoglobulin light chain, a heavy- chain of an antibody to an activation site on a cytotoxic cell, retaining a CHI domain capable of light chain binding, and a light chain of said antibody; b) culturing said host cells so as to express said DNA sequences to produce a mixture of (i) a heterotrimer bispecific immunoadhesin comprising a foreign antigen binding domain-immunoglobulin heavy chain fusion disulfide linked
  • CHI first
  • the foreign antigen may, for example, be an integral viral protein of a retrovirus such as HIV, when the specific binding is to a site within the gp 160, gp 120 or gp 41 domain.
  • a molecule known to bind gp 120 is the cell surface glycoprotein CD4.
  • the cytotoxic cells to be activated preferably are cytotoxic T cells or large granular lymphocytes, and the activation molecule preferably is CD3 or CD16.
  • the invention concerns a method for isolating a substantially homogeneous heterotrimeric bispecific immunoadhesin composed of an immunoglobulin heavy chain with a first functionality covalently linked with an immunoglobulin heavy chain-light chain pair with a second functionality from a mixture with a homodimer composed of two covalently linked immunoglobulin heavy chains of the first functionality and a heterotetramer composed of two covalently linked heavy chain light chain pairs of the second functionality, which comprises separating the heterotrimeric bispecific immunoadhesin from the accompanying heterotetramer and homodimer by two-step chromatography, in optional order, based on the first functionality and on the immunoglobulin light chain, respectively. If desired, at least one of the chromatographic purification steps may be repeated.
  • the invention relates to a substantiallyhomogeneous bispecific immunoadhesin comprising a binding domain for an integral viral protein of a retrovirus fused to an immunoglobulin heavy chain constant domain sequence lacking an immunoglobulin light chain binding site covalently linked to a heavy chain-light chain pair of an antibody to an activation molecule on the surface of a cytotoxic cell.
  • the bispecific immunoadhesin is designed to have an HIV binding sequence and a sequence serving to retarget cytotoxic T lymphocytes or large granular lymphocytes to fight HIV infection.
  • the invention concerns a method for the prevention or treatment of HIV infection in a human exposed to HIV, by administering an effective amount of a trimeric bispecific immunoadhesin with one arm specifically recognizing HIV on a target cell, and with the other arm an activation molecule on a cytotoxic cell.
  • the invention concerns a method for preventing the transmission of HIV infection from an HIV seropositive pregnant women to the fetus by administering to the pregnant women an effective amount of a trimeric bispecific IgG immunoadhesin with one arm specifically recognizing HIV on a target cell, and with the other arm an activation molecule on a cytotoxic cell.
  • bispecific immunoadhesins that can be made and purified in an analogous manner include, for example, CD4-IgG x anti-CD16 mAb, t-PA-IgG x anti-fibrin mAb, tumor necrosis factor receptor (TNFR)-IgG x anti-endotoxin mAb, CD4-IgG x TNFR-IgG, CD4-IgG x L-selectin-IgG etc.
  • the last mentioned molecule combines the lymph node binding function of the lymphocyte homing receptor (LHR, L-selectin) , and the HIV binding function of CD4, and finds potential application in the prevention or treatment of HIV infection, related conditions, or as a diagnostic.
  • All bispecific immunoadhesins of the present invention may be incorporated in liposomes, preferably in combination with other therapeutics with similar indications, thereby facilitating combination therapy.
  • Figure 1 illustrates the structure of (CD4xanti-CD3) bispecific immunoadhesin.
  • A Subunit structures of the antibody heavy and light chains and the CD4-IgG-l chimeric protein used in the construction of the bispecific immunoadhesin.
  • B Schematic structure of a (CD4xanti-CD3) bispecific immunoadhesin heterotrimer.
  • Figure 2 shows the production of the (CD4xanti-CD3) bispecific immunoadhesin heterotrimers, anti-CD3 ( ⁇ .CD3) heterotetramers, and CD4-immunoadhesin homodimers (CD4-IgG) using different proportions (drawn as percentage) of each DNA.
  • the total amount of plasmid DNA was 20 ⁇ g in all cases.
  • Transfected cells were metabolically labeled with 35 S- methionine, and the proteins were precipitated from serum- free supernatants using protein A and analysed by SDS-PAGE and autoradiography.
  • Figure 3 shows the separation of the (CD4xanti-CD3) bispecific immunoadhesin tererotrimer, the anti-CD3 heterotetramer, and the CD4-immunoadhesin homodimers by affinity chromatography as described in Example 1.
  • FIG. 4 Specificity of lysis of uninfected cells (CEM) (a) and HIV infected cells (CEM/IIIB) (b) by effector cells plus antibody.
  • Target cells were labeled overnight and incubated at room temperature with different antibodies at 1 ⁇ g/ml fr one hour, and then incubated at 37°C with the three effector cells, PBL-IL2 (black bars) , PBL+IL-2 (white bars) and CTL (shaded bars), for three hours.
  • PBL-IL2 black bars
  • PBL+IL-2 white bars
  • CTL shade bars
  • FIG. Lysis of HIV infected cells (CEM/IIIB) by effector cells plus antibody in the absence (a) or in the presence of 8% (b) or 50% (c) human serum.
  • Figure 6. Dose dependent effect of bispecific immunoadhesin mediated CEM/IIIB lysis by CTL (the vertical bars show the standard deviations) .
  • Antibodies (Abs) and immunoglobulins (Igs) are glycoproteins having the same structural characteristics. While antibodies exhibit binding specificity to a specific antigen, immunoglobulins include both antibodies and other antibody-like molecules which lack antigen specificity. Polypeptides of the latter kind are, for example, produced at low levels by the lymph system and at increased levels by myelomas. In structural sense the terms "antibody” and “immunoglobulin” are used interchangeably throughout the specification, however, a clear distinction will be made when discussing functional features associated with antigen specificity. Native antibodies and immunoglobulins are usually heterotetrameric glycoproteins of about 150,000 daltons, composed of two identical light (L) chains and two identical heavy (H) chains.
  • Each light chain is linked to a heavy chain by one covalent disulfide bond, while the number of disulfide linkages varies between the heavy chains of different immunoglobulin isotypes.
  • Each heavy and light chain chain also has regularly spaced intrachain_disulfide bridges.
  • Each heavy chain has at one end a variable domain
  • each light chain has a variable domain at one and (V L ) and a constant domain at its other end; the constant domain of the light chain is aligned with the first constant domain of the heayy_ chain, and the light chain variable domain is aligned with the variable domain of the heavy chain.
  • Particular amino acid residues are believed to form an interface between the light and heavy chain variable domains [Clothia et al . , . Mol. Biol. 186, 651-663 (1985) ; Novotny and Haber, Proc. Natl. Acad. Sci. USA 82. 4592-4596 (1985)].
  • variable domains of antibodies The variability is not evenly distributed through the variable regions of antibodies. It is concentrated in three segments called complementarity determining regions (CDRs) or hypervariable regions both in the light chain and the heavy chain variable regions.
  • CDRs complementarity determining regions
  • FR framework
  • the variable domains of native heavy and light chains each comprise four FR regions, largely adopting a ⁇ -sheet configuration, connected by three CDRs, which form loops connecting, and in some cases forming part of, the /3-sheet structure.
  • the CDRs in each chain are held together in close proximity by the FR regions and, with the CDRs from the other chain, contribute to the formation of the antigen binding site of antibodies [see Kabat, E.A. et al .
  • Fv is the minimum antibody fragment which contains a complete antigen recognition and binding site. This region consists of a dimer of one heavy and one light chain variable domain in tight, non-covalent association. It is in this configuration that the three CDRs of each variable domain interact to define an antigen binding site on the surface of the V H -V L dimer. Collectively, the six CDRs confer antigen binding specificity to the antibody. However, even a single variable domain (or half of an Fv comprising only three CDRs specific for an antigen) has the ability to recognize and bind antigen, although at a lower affinity than the entire binding site.
  • the light chains of immunoglobulins from any vertebrate species can be assigned to one of two clearly distinct types, called kappa and lambda ( ⁇ ) , based on the amino acid sequences of their constant domains.
  • immunoglobulins can be assigned to different classes. There are five major classes of immunoglobulins: IgA, IgD, IgE, IgG and IgM, and several of these may be further divided into subclasses (isotypes) , e.g. IgG-1, IgG-2, IgG-3, and IgG-4.
  • the heavy chain constant regions hat correspond to the different classes of immunoglobulins are called ⁇ , delta, epsilon, ⁇ , and ⁇ , respectively.
  • the subunit structures and three-dimensional configurations of different classes of immunoglobulins are well known.
  • the term "monoclonal antibody (mAb)" as used herein refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e., the individual antibodies comprising the population are identical except for possible naturally occurring mutations that may be present in minor amounts. Thus, the modifier "monoclonal” indicates the character of the antibody as not being a mixture of discrete antibodies.
  • the monoclonal antibodies include hybrid and recombinant antibodies produced by splicing a variable (including hypervariable) domain of an antibody with a constant domain (e.g.
  • “humanized” antibodies or a light chain with a heavy chain, or a chain from one species with a chain from another species, or fusions with heterologous proteins, regardless of species of origin or immunoglobulin class or subclass designation, as well as antibody fragments (e.g., Fab, F(ab') 2 , and Fv) .
  • Cabilly et. al. , U.S. Pat. No. 4,816,567; Mage &_ Lamoyi, in Monoclonal Antibody Production Techniques and Applications, pp.79-97 (Marcel Dekker, Inc., New York, 1987) .
  • the modifier "monoclonal” indicates the character of the antibody as being obtained from such a substantially homogeneous population of antibodies, and is not to be construed as requiring production of the antibody by any particular method.
  • Humanized forms of non-human (e.g. murine) antibodies are immunoglobulins, immunoglobulin chains or fragments thereof (such as Fv, Fab, Fab', F(ab') 2 or other antigen- binding subsequences of antibodies) which contain minimal sequence derived from non-human immunoglobulin.
  • humanized antibodies are human immunoglobulins (recipient antibody) in which residues from a complementary determining region (CDR) of the recipient are replaced by residues from a CDR of a non-human species (donor antibody) such as mouse, rat or rabbit having the desired specificity, affinity and capacity.
  • donor antibody such as mouse, rat or rabbit having the desired specificity, affinity and capacity.
  • Fv framework residues of the human immunoglobulin are replaced by corresponding non-human residues.
  • humanized antibody may comprise residues which are found neither in the recipient antibody nor in the imported CDR or framework sequences. These modifications are made to further refine and optimize antibody performance.
  • chimeric and “humanized” antibodies see, for example, U.S. Patent No. 4,816,567; WO 91/09968; EP 452,508; and WO 91/16927).
  • immunoadhesin designates antibody-like molecules which combine the binding specificity of a heterologous protein (an “adhesin”) with the effector functions of immunoglobulin constant domains.
  • the immunoadhesins comprise a fusion of an amino acid sequence with the desired binding specificity which is other than the antigen recognition and binding site (antigen combining site) of an antibody (i.e. is "heterologous"), and an immunoglobulin constant domain sequence.
  • the adhesin part of an immunoadhesin molecule typically is a contiguous amino acid sequence comprising at least the binding domain of a receptor (including cell adhesion molecules) or a ligand.
  • the immunoglobulin constant domain sequence in the immunoadhesins may be obtained from any immunoglobulin, such as IgG-1, IgG-2, IgG-3, or IgG-4 subtypes, IgA, IgE, IgD or IgM.
  • the C-terminus of the heterologous binding domain is fused to the N-terminus of an immunoglobulin constant region sequence, in place of the variable region(s) , however N-terminal fusions are also possible.
  • such fusions retain at least functionally active hinge, CH2 and CH3 domains of the constant region of an immunoglobulin heavy chain. Fusions are also made to the C-terminus of the Fc portion of a constant domain, or immediately N-terminal to the CHI of the heavy chain or the corresponding region of the light chain. This ordinarily is accomplished by constructing the appropriate DNA sequence and expressing it in recombinant cell culture.
  • immunoadhesins may be synthesized according to known methods.
  • the C-terminus of an amino acid sequence which comprises the binding site(s) for a receptor or ligand is fused, at the N-terminal end, to the C- terminal portion of an antibody (in particular the Fc domain) , containing the effector functions of an immunoglobulin, e.g. immunoglobulin G- ⁇ (IgG-1) . It is possible to fuse the entire heavy chain constant region to the sequence containing the binding site(s).
  • a sequence beginning in the hinge region just upstream of the papain cleavage site (which defines IgG Fc chemically; residue 216, taking the first residue of heavy- chain constant region to be 114 [Kobet et al . , supra] , or analogous sites of other immunoglobulins) is used in the fusion.
  • the amino acid sequence containing the ligand or receptor binding site(s) is fused to the hinge region and CH2, CH3; or CHI, hinge, CH2 and CH3 domains of an IgG-1, IgG-2, IgG-3, or IgG-
  • bispecific immunoadhesin designates immunoadhesins (as hereinabove defined) having at least two binding specificities, one of which may be (but does not need to be) an antigen binding site of an antibody.
  • Bispecific immunoadhesins can generally be assembled as hetero-multimers, and particularly as hetero-dimers, -trimers or -tetramers, essentially as disclosed in WO 89/02922 (published 6 April 1989), in EP 314,317 (published 3 May 1989), and in U.S. Patent No. 5,116,964 issued 2 May 1992.
  • trimeric bispecific immunoadhesin is used to designate a structure where in one arm of a Y-shaped immunoglobulin, the first heavy chain constant domain (CHI) is removed or altered to eliminate its ability to covalently bind to an immunoglobulin light chain (i.e. the light chain binding site is eliminated) , while in the other arm the light chain binding site within the CHI domain is retained, and is covalently linked to an immunoglobulin light chain.
  • CHI first heavy chain constant domain
  • the heavy chain constant domain sequences are fused to "binding domains" (replacing the heavy chain variable domains) which are different from one another.
  • One of the binding domains is heterologous (i.e. is not an antibody antigen combining site) whereas the other binding domain may be a different heterologous binding domain or a sequence comprising an antigen combining site of an antibody.
  • the resultant structure is a trimer with two different binding specificities (heterotrimer) composed of an immunoglobulin heavy chain constant domain sequence fused to a first binding domain and a second immunoglobulin heavy chain constant domain sequence fused to a different binding domain and covalently linked to an immunoglobulin light chain.
  • the heterologous binding domain preferably is a peptide or a polypeptide which is capable of specific binding to a native ligand or receptor (ligand or receptor binding domain) .
  • a light chain binding site is preferably retained in the heavy chain carrying a binding domain for which there is no readily available separation method (e.g. selective binding agent) available.
  • the heavy chain in this arm of the bispecific immunoadhesin molecule will covalently bind an immunoglobulin light chain, which can be specifically recognized and separated, for example by commercially available, light chain-specific antibodies.
  • a substantially intact CHI domain is retained in this arm of the bispecific immunoadhesin molecule.
  • Two or more of the heterotrimers may be covalently linked to each other to provide a multimeric structure.
  • these assembled bispecific immunoadhesins will have known unit structures.
  • a three-chain unit may be repeated similarly to the higher molecular weight immunoglobulins, such as IgM which generally exists as a pentamer of basic four-chain units held together by disulfide bonds, or as IgA globulin, and occasionally IgG globulin, which may also exist in multimeric form in serum.
  • each three-chain unit may be the same or different.
  • immunoglobulin heavy chain constant domain sequence lacking a(n immunoglobulin) light chain binding site is used to designate an immunoglobulin heavy chain constant domain sequence from which sequence elements to which the light chain is ordinarily linked are removed or sufficiently altered (mutated) so that such binding is no longer possible.
  • the entire CHI domain is deleted but shorter truncations of immunoglobulin constant domains are also suitable, provided that the section to which the light chain is ordinarily disulfide-bonded or interacts with non-covalently is removed.
  • the light chain binding region of an immunoglobulin heavy chain constant domain may be mutated (by substitution or insertion) so that it is no longer capable of covalent or non-covalent binding to an immunoglobulin light chain.
  • ligand binding domain refers to any native cell-surface receptor or any region or derivative thereof retaining at least a qualitative ligand binding ability, and preferably the biological activity of a corresponding native receptor.
  • the receptor is from a cell-surface polypeptide having an extracellular domain which is homologous to a member of the immunoglobulin supergenefamily.
  • receptors for cytokines and in particular receptors with tyrosine kinase activity (receptor tyrosine kinases) , members of the hematopoietin and nerve growth factor receptor superfamilies, and cell adhesion molecules, e. g. (E-, L- and P-) selectins.
  • receptor binding domain is used to designate any native ligand for a receptor, including cell adhesion molecules, or any region or derivative of such native ligand retaining at least a qualitative receptor binding ability, and preferably the biological activity of a corresponding native ligand.
  • a multigene family is a group of homologous genes with similar functions.
  • the names “supergene family” “gene superfamily” and “superfamily” refer to a set of multigene families and single-copy genes that are related by sequence homology but not necessarily in function.
  • Polypeptides encoded by members of the immunoglobulin supergene family contain domains with homology to constant-region domains of immunoglobulins, and include class I and class II major histocompatibility antigens, immunoglobulins and T-cell receptor ⁇ _, ⁇ , ⁇ and delta chains, such as, for example, CD1, CD2, CD4, CD8, CD28, the ⁇ , delta and kappa chains of CD3, OX-2, Thy-1, the intracellular or neural cell adhesion molecules (I-CAM or N- CAM) , lymphocyte function associated antigen-3 (LFA-3) , neurocytoplasmic protein (NPC-3) , poly-Ig receptor, myelin- associated glycoprotein (MAG) , high affinity IgE receptor, the major glycoprotein of peripheral myelin (Po) , platelet derived growth factor receptors (PDGF-A and PDGF-B) , colony stimulating factor 1 (
  • Homologous as defined herein means having the sequence of a member of the immunoglobulin gene superfamily or having a sequence therewith which has substantially the same as (or a greater degree of) amino acid sequence homology to a known member of the superfamily as the specific examples given above to an immunoglobulin variable or constant domain.
  • CD4 is used to designate a native-sequence CD4 molecule [Maddon et al . , Cell 42., 93 (1985); WO 88/01304 published 25 February 1988] , or any fragment or derivative thereof, whether isolated from natural souce, chemically synthesized or produced by methods of recombinant DNA technology, provided that they retain at least a qualitative
  • lymphocyte homing receptor and “L-selectin” are used interchangeably, and designate a native-sequence homing receptor molecule as disclosed in U.S. patent
  • derivative is used to define amino acid sequence and glycosylation variants, and covalent modifications of a native sequence protein, including receptor, ligand or immunoglobulin sequences that can be used in the construction of the bispecific immunoadhesins of the present invention.
  • amino acid and “amino acids” refer to all naturally occurring L- ⁇ _-amino acids.
  • amino acids are identified by either the single-letter or three-letter designations:
  • amino acids may be classified according to the chemical composition and properties of their side chains.
  • Acidic Residues aspartic acid, glutamic acid Basic Residues: lysine, arginine, histidine
  • Hydrophilic Residues serine, threonine, asparagine, glutamine
  • Aliphatic Residues glycine, alanine, valine, leucine, isoleucine
  • Non-polar Residues cysteine, methionine, proline
  • Aromatic Residues phenylalanine, tyrosine, tryptophan
  • amino acid sequence variant refers to molecules with some differences in their amino acid sequences as compared to a native amino acid sequence.
  • the DNA sequences encoding such amino acid sequence variants are preferably capable, under stringent conditions, of hybridizing to the complement of a DNA sequence encoding the ligand binding domain of a native receptor sequence, the receptor binding domain of a native ligand sequence, a coresponding native immunoglobulin chain or the antigen combining site of a native antibody.
  • the amino acid sequence variants will possess at least about 70% homology with a receptor binding domain of a native ligand sequence, a ligand binding domain with a native receptor sequence, a native immunoglobulin sequence, or (when one of the binding domains present in the bispecific immunoadhesin is an antibody antigen combining site) with the antigen combining site of a native antibody.
  • the homology preferably is at least about 80%, more preferably at least about 90%.
  • the amino acid sequence variants possess substitutions, deletions, and/or insertions at certain positions within a corresponding native amino acid sequence.
  • “Homology” is defined as the percentage of residues in the candidate amino acid sequence that are identical with the residues in the amino acid sequence of their native counterparts after aligning the sequences and introducing gaps, if necessary, to achieve the maximum percent homology. Methods and computer programs for the alignment are well known in the art.
  • Substitutional variants are those that have at least one amino acid residue in a native sequence removed and a different amino acid inserted in its place at the same position.
  • the substitutions may be single, where only one amino acid in the molecule has been substituted, or they may be multiple, where two or more amino acids have been substituted in the same molecule.
  • Insertional variants are those with one or more amino acids inserted immediately adjacent to an amino acid at a particular position in a native sequence. Immediately adjacent to an amino acid means connected to either the ⁇ _- carboxy or ⁇ -amino functional group of the amino acid.
  • Deletional variants are those with one or more amino acids in the native amino acid sequence removed. Ordinarily, deletional variants will have one or two amino acids deleted in a particular region of the molecule.
  • glycosylation variant is used to refer to a glycoprotein having a glycosylation profile different from that of a native counterpart.
  • Glycosylation of polypeptides is typically either N-linked or 0-linked.
  • N-linked refers to the attachment of the carbohydrate moiety to the side-chain of an asparagine residue.
  • the tripeptide sequences, asparagine-X-serine and asparagine-X-threonine, wherein X is any amino acid except proline, are recognition sequences for enzymatic attachment of the carbohydrate moiety to the asparagine side chain.
  • O-linked glycosylation refers to the attachment of one of the sugars N-acetylgalactosamine, galactose, or xylose to a hydroxyamino acid, most commonly serine or threonine, although 5-hydroxyproline or 5- hydroxylysine may also be involved in 0-linked glycosylation. Any difference in the location and/or nature of the carbohydrate moieties present in a ligand as compared to its native counterpart is within the scope herein.
  • glycosylation pattern of native glycoproteins can be determined by well known techniques of analytical chemistry, including HPAE chromatography [Hardy, M.R. et al . , Anal. Biochem. 170. 54-62 (1988)], methylation analysis to determine glycosyl-linkage composition [Lindberg, B., Meth. Enzvmol. 28. 178-195 (1972); Waeghe, T.J. et al . , Carbohydr. Res. 123, 281-304 (1983)], NMR spectroscopy, mass spectrometry, etc.
  • binding domain variant and “variant binding domain”, that are used interchangeably, include both amino acid sequence variants and glycosylation variants of a native binding domain sequence.
  • Covalent derivatives include modifications of a native amino acid sequence with an organic proteinaceous or non- proteinaceous derivatizing agent, and post-translational modifications. Covalent modifications are traditionally introduced by reacting targeted amino acid residues of the polypeptide to be modified with an organic derivatizing agent that is capable of reacting with selected side-chains or terminal residues, or by harnessing mechanisms of post- translational modifications that function in selected recombinant host cells.
  • the resultant covalent derivatives are useful in programs directed at identifying residues important for biological activity, for immunoassays, or for the preparation of antibodies for immunoaffinity purification of the recombinant glycoprotein.
  • Certain post-translational modifications are the result of the action of recombinant host cells on the expressed polypeptide. Glutaminyl and asparaginyl residues are frequently post-translationally deamidated to the corresponding glutamyl and aspartyl residues. Alternatively, these residues are deamidated under mildly alkaline conditions. Either form of these residues may be present in the polypeptides used in accordance with the present invention.
  • Covalent derivatives specifically include fusion molecules in which native or variant amino acid sequences are covalently bonded to a nonproteinaceous polymer.
  • the nonproteinaceous polymer ordinarily is a hydrophilic synthetic polymer, i.e. a polymer not otherwise found in nature.
  • polymers which exist in nature and are produced by recombinant or in vi tro methods are useful, as are polymers which are isolated from nature.
  • Hydrophilic polyvinyl polymers fall within the scope of this invention, e.g. polyvinylalcohol and polyvinylpyrrolidone.
  • Particularly useful are polyvinylalkylene ethers such a polyethylene glycol, polypropylene glycol.
  • the binding domains may be linked to_ various nonproteinaceous polymers, such as polyethylene glycol, polypropylene glycol or polyoxyalkylenes, in the manner set forth in U.S. Patent Nos. 4,640,835; 4,496, " 689; 4,301,144; 4,670,417; 4,791,192 or 4,179,337.
  • the bispecific immunoadhesins of the present invention ⁇ are purified to substantial homogeneity.
  • the phrases "substantially homogeneous” “substantially homogeneous form” and “substantial homogeneity” are used to indicate that the product is substantially devoid of by-products originated from undesired immunoglobulin chain combinations. Expressed in terms of purity, substantial homogeneity means that the amount of immunoglobulin sequence containing by-products does not exceed 5 %, and preferably is below 1 %, more preferably below 0.5 %, most preferably below 0.1%, wherein the percentages are by weight.
  • lymphadenopathy associated virus LAV
  • HTLV-III human T cell lymphotropic virus-Ill
  • ARV AIDS associated retrovirus
  • HIV is a retrovirus, containing three regions encoding structural proteins.
  • the gag region encodes the core proteins of the virion
  • the pol region encodes the virion reverse transcriptase
  • the env (envelope) region encodes the major glycoprotein found in the membrane of the cells infected with the HIV virus.
  • the structural element which is believed to play a fundamental role in the pathogenesis of the virus is the env region encoding a precursor env polypeptide gp 160. Cleavage of this precursor yields gp 120
  • gp 41 a transmembrane protein of about
  • the specific site within the major envelope glycoprotein of HIV which is targeted for binding in accordance with the present invention preferably is within the gp 160, gp 120, gp 41 regions or on the gp 120/gp 41 complex.
  • progeny in the context of the present invention the expressions "cell”, “cell line”, and “cell culture” are used interchangeably, and all such designations include progeny. It is also understood that all progeny may not be precisely identical in DNA content, due to deliberate or inadvertent mutations. Mutant progeny that have the same function or biological property, as screened for in the originally transformed cell, are included. "Transformation” means introducing DNA into an organism so that the DNA is replicable, either as an extrachromosomal element or by chromosomal integration.
  • Transfection refers to the taking up of an expression vector by a host cell whether or not any coding sequences are in fact expressed.
  • transformed host cell and “transformed” refer to the introduction of DNA into a cell.
  • the cell is termed a "host cell”, and it may be a prokaryotic or a eukaryotic cell.
  • Typical prokaryotic host cells include various strains of E. coli.
  • Typical eukaryotic host cells are mammalian, such as Chinese hamster ovary cells or human embryonic kidney 293 cells.
  • the introduced DNA is usually in the form of a vector containing an inserted piece of DNA.
  • the introduced DNA sequence may be from the same species as the host cell or a different species from the host cell, or it may be a hybrid DNA sequence, containing some foreign and some homologous DNA.
  • replicable expression vector and "expression vector” refer to a piece of DNA, usually double-stranded, which may have inserted into it a piece of foreign DNA.
  • Foreign DNA is defined as heterologous DNA, which is DNA not naturally found in the host cell.
  • the vector is used to transport the foreign or heterologous DNA into a suitable host cell. Once in the host cell, the vector can replicate independently of the host chromosomal DNA, and several copies of the vector and its inserted (foreign) DNA may be generated.
  • the vector contains the necessary elements that permit translating the foreign DNA into a polypeptide. Many molecules of the polypeptide encoded by the foreign DNA can thus be rapidly synthesized.
  • Oligonucleotides are short-length, single- or double- stranded polydeoxynucleotides that are chemically synthesized by known methods [such as phosphotriester, phosphite, or phosphoramidite chemistry, using solid phase techniques such as those described in EP 266,032, published 4 May 1988, or via deoxynucleoside H-phosphanate intermediates as described by Froehler et al . , Nucl . Acids Res. 14, 5399 (1986)] . They are then purified on polyacrylamide gels.
  • immunoglobulins of IgG-1, IgG-2 and IgG-4 isotypes are good candidates, as they all have in vivo half- lives of 21 days, as opposed to IgG-3 which has an in vivo half-life of 7 days. Further differences that might be advantages or detriments in certain situations are, for example, in complement activation. IgG-1, IgG-2 and IgG-3 all activate complement, however, IgG-2 is significantly weaker at complement activation than IgG-1 and does not bind to Fc receptors on mononuclear cells or neutrophils, while IgG-3 shows better complement activation than IgG-1.
  • IgG-1 has only four serologically-defined allotypic sites, two of which (Glml and 2) are in the Fc portion; for two of these sites (Glml and 17) one allotype is non-immunogenic. In contrast, there are 12 serologically defined allotypes in IgG-3, all of which are in the Fc portion, only three of which (G3m5, 11 and 21) have an allotype which is non- immunogenic. Thus, for repeated and long-term therapeutic applications, immunoadhesins with IgG-1 derived constant domain sequences are preferred. It is possible to use immunoglobulins from different classes or isotypes in the two arms of the bispecific immunoadhesin molecule. It is further possible to combine sequences from various immunoglobulin classes or isotypes in the same arm of the molecule. For example, constructs in which the hinge of IgG-1 is replaced with that of IgG-3 are fully functional.
  • the DNA encoding a native protein from which the binding domain may be originated may be obtained from any cDNA library prepared from tissue believed to possess mRNA for the desired protein and to express it at a detectable level. Libraries are screened with probes designed to identify the gene of interest or the protein encoded by it.
  • suitable probes usually include mono- and polyclonal antibodies that recognize and specifically bind to the desired protein; oligonucleotides of about 20-80 bases in length that encode known or suspected portions of the ligand cDNA from the same or different species; and/or complementary or homologous cDNAs or their fragments that encode the same or similar gene.
  • PCR polymerase chain reaction
  • Another alternative is to chemically synthesize the gene encoding a desired (native or variant) protein comprising a binding domain using one of the methods described in Engels et al . , Agnew. Chem. Int. Ed. Engl. 28. 716 (1989) . These methods include triester, phosphite, phosphoramidite and H- phosphonate methods, PCR and other autoprimer methods, and oligonucleotide syntheses on solid supports.
  • amino acid sequence variants of the bispecific immunoadhesins of this invention are preferably constructed by mutating a DNA sequence that encodes a native protein sequence used in their construction or by starting from an earlier made variant sequence. General methods suitable for making amino acid sequence variants of polypeptides will be detailed hereinafter.
  • the sugar(s) may be attached to (a) arginine and histidine, (b) free carboxyl groups, (c) free sulfhydral groups such as those of cysteine, (d) free hydroxyl groups such as those of serine, threonine, or hydroxyproline, (e) aromatic residues such as those of phenylalanine, tyrosine, or tryptophan or (f) the amide group of glutamine.
  • Carbohydrate moieties present on a native glycoprotein sequence may also be removed chemically or enzymatically. Chemical deglycosylation requires exposure to trifluoromethanesulfonic acid or an equivalent compound. This treatment results in the cleavage of most or all sugars, except the linking sugar, while leaving the polypeptide intact. Chemical deglycosylation is described by Hakimuddin et al . , Arch. Biochem. Biophys. 259. 52 (1987) and by Edge et al . , Anal. Biochem. 118, 131 (1981) . Carbohydrate moieties can be removed by a variety of endo- and exoglycosidases as described by Thotakura et al .
  • Glycosylation variants of the amino acid sequences used in the construction of the bispecific immunoadhesins herein can also be produced by selecting appropriate host cells.
  • Yeast for example, introduce glycosylation which varies significantly from that of mammalian systems.
  • mammalian cells having a different species e.g. hamster, murine, insect, porcine, bovine or ovine
  • tissue e.g. lung, liver, ly phoid, mesenchymal or epidermal
  • Preparation of variants of the bispecific immunoadhesins of the present invention is preferably achieved by site-specific mutagenesis of DNA that encodes an earlier prepared variant or a nonvariant version of the target variant protein.
  • Site- specific mutagenesis allows the production of variants through the use of specific oligonucleotide sequences that encode the DNA sequence of the desired mutation, as well as a sufficient number of adjacent nucleotides to provide a primer sequence of sufficient size and sequence complexity to form a stable duplex on both sides of the junction being traversed.
  • a primer of about 20 to 25 nucleotides in length is preferred, with about 5 to 10 residues on both sides of the junction of the sequence being altered.
  • the technique of site-specific mutagenesis is well known in the art as exemplified by publications such as Adelman et al. , DNA, 2 : 183 (1983).
  • the site-specific mutagenesis technique typically employs a phage vector that exists in both a single-stranded and double-stranded form.
  • Typical vectors useful in site-directed mutagenesis include vectors such as the M13 phage, for example, as disclosed by Messing et al., Third Cleveland Symposium on Macromolecules and Recombinant DNA, Editor A. Walton, Elsevier, Amsterdam (1981) . These phage are readily commercially available and their use is generally well known to those skilled in the art.
  • plasmid vectors that contain a single- stranded phage origin of replication may be employed to obtain single- stranded DNA.
  • site-directed mutagenesis may, for example, be performed by first obtaining a single-stranded vector that includes within its sequence a DNA sequence that encodes the relevant non-mutated amino acid sequence.
  • An oligonucleotide primer bearing the desired mutated sequence is prepared, generally synthetically, for example, by the method of Crea et al., Proc. Natl. Acad. Sci. (USA), 25: 5765 (1978). This primer is then annealed with the single-stranded non-mutated sequence-containing vector, and subjected to DNA-polymerizing enzymes such as E ⁇ _ coli polymerase I Klenow fragment, to complete the synthesis of the mutation-bearing strand.
  • DNA-polymerizing enzymes such as E ⁇ _ coli polymerase I Klenow fragment
  • heteroduplex is formed wherein one strand encodes the original non-mutated sequence and the second strand bears the desired mutation.
  • This heteroduplex vector is then used to transform appropriate cells such as JM101 cells and clones are selected, via hybridization to a radioactive probe consisting of the 32 P-labeled mutagenesis primer, that include recombinant vectors bearing the mutated sequence arrangement.
  • the mutated region may be removed and placed in an appropriate vector for the production of the desired variant, generally an expression vector of the type that typically is employed for transformation of an appropriate eukaryotic host.
  • an appropriate vector for the production of the desired variant generally an expression vector of the type that typically is employed for transformation of an appropriate eukaryotic host.
  • Chinese hamster ovary (CHO) cells or 293 are preferred for the preparation of long-term stable polypeptide producers.
  • the invention is not limited to CHO production, as it is known that numerous other cell types are suitably employed, particularly where one desires only transient production of the enzyme for test purposes.
  • Another method for making mutations in the DNA sequence encoding a bispecific immunoadhesin or any portion thereof involves cleaving the DNA at the appropriate position by digestion with restriction enzymes, recovering the properly cleaved DNA, synthesizing an oligonucleotide encoding the desired amino acid and flanking regions such as polylinkers with blunt ends (or, instead of using polylinkers, digesting the synthetic oligonucleotide with the restriction enzymes also used to cleave the ligand-encoding DNA, thereby creating cohesive termini) , and ligating the synthetic DNA into the remainder of the structural gene encoding the bispecific immunoadhesin or any desired portion thereof.
  • PCR mutagenesis is also suitable for making polypeptides for practicing the present invention. While the following discussion refers to DNA, it is understood that the technique also find application with RNA.
  • the PCR technique generally refers to the following procedure. When small amounts of template DNA are used as starting material in a PCR, primers that differ slightly in sequence from the corresponding region in a template DNA can be used to generate relatively large quantities of a specific DNA fragment that differs from the template sequence only at the positions where the primers differ from the template.
  • one of the primers is designed to overlap the position of the mutation and to contain the mutation; the sequence of the other primer must be identical to a stretch of sequence of the opposite strand of the plasmid, but this sequence can be located anywhere along the plasmid DNA. It is preferred, however, that the sequence of the second primer is located within 200 nucleotides from that of the first, such that in the end the entire amplified region of DNA bounded by the primers can be easily sequenced.
  • PCR amplification using a primer pair like the one just described results in a population of DNA fragments that differ at the position of the mutation specified by the primer, and possibly at other positions, as template copying is somewhat error-prone.
  • the vectors and methods disclosed herein are suitable for use in host cells over a wide range of eukaryotic organisms.
  • prokaryotes are preferred for the initial cloning of DNA sequences and constructing the vectors useful in the invention.
  • E ⁇ coli K12 strain 294 ATCC No. 31,446
  • coli strain W3110 ATCC No. 27,325
  • E ⁇ _ coli strains such as E ⁇ coli B, and E ⁇ . coli X1776 (ATCC No. 31,537) . These examples are, of course, intended to be illustrative rather than limiting.
  • Prokaryotes also are useful for expression.
  • the aforementioned strains, as well as bacilli such as Bacillus subtilis, and other enterobacteriaceae such as, e.g., Salmonella tvphimurium or Serratia marcesans. and various Pseudomonas species are examples of useful hosts for expression.
  • plasmid vectors containing replicon and control sequences that are derived from species compatible with the host cell are used in connection with these hosts.
  • the vector ordinarily carries a replication site, as well as marking sequences that are capable of providing phenotypic selection in transformed cells.
  • E j _ coli is typically transformed using pBR322, a plasmid derived from an
  • E. coli species see, e.g., Bolivar et al. , Gene, 2 : 95
  • pBR322 contains genes for ampicillin and tetracycline resistance and thus provides easy means for identifying transformed cells.
  • the pBR322 plasmid, or other microbial plasmid or phage, must also contain, or be modified to contain, promoters that can be used by the microbial organism for expression of its own proteins. Those promoters most commonly used in recombinant DNA construction include ⁇ -lactamase (penicillinase) and lactose promoter systems (Chang et al. , Nature, 375 : 615 (1978); Itakura et al. , Science, 198 : 1056 (1977) ; Goeddel et al.
  • Saccharomvces cerevisiae or common baker's yeast, is the most commonly used among eukaryotic microorganisms, although a number of other strains are commonly available.
  • This plasmid already contains the trpl gene that provides a selection marker for a mutant strain of yeast lacking the ability to grow in tryptophan, for example, ATCC No. 44,076 or PEP4-1 (Jones, Genetics, 85: 12 (1977)) .
  • the presence of the trpl lesion as a characteristic of the yeast host cell genome then provides an effective environment for detecting transformation by growth in the absence of tryptophan.
  • Suitable promoting sequences in yeast vectors include the promoters for 3-phosphoglycerate kinase (Hitzeman et al. , J.
  • the termination sequences associated with these genes are also ligated into the expression vector 3' of the sequence desired to be expressed to provide polyadenylation of the mRNA and termination.
  • Other promoters that have the additional advantage of transcription controlled by growth conditions are the promoter region for alcohol dehydrogenase 2, isocytochrome C, acid phosphatase, degradative enzymes associated with nitrogen metabolism, and the aforementioned glyceraldehyde-3-phosphate dehydrogenase, and enzymes responsible for maltose and galactose utilization.
  • Any plasmid vector containing yeast-compatible promoter, origin of replication and termination sequences is suitable.
  • cultures of cells derived from multicellular organisms may also be used as hosts.
  • any such cell culture is workable, whether from vertebrate or invertebrate culture.
  • interest has been greatest in vertebrate cells, and propagation of_ vertebrate cells in culture (tissue culture) has become a routine procedure in recent years [Tissue Culture. Academic Press, Kruse and Patterson, editors (1973)].
  • useful host cell lines are VERO and HeLa cells, CHO cell lines, and W138, BHK, COS-7, (ATCC CRL 1651), 293, and MDCK (ATCC CCL 34) cell lines.
  • Expression vectors for such cells ordinarily include (if necessary) an origin of replication, a promoter located in front of the gene to be expressed, along with any necessary ribosome binding sites, RNA splice sites, polyadenylation sites, and transcriptional terminator sequences.
  • control functions on the expression vectors are often provided by viral material.
  • promoters are derived from polyoma, Adenovirus2, and most frequently Simian Virus 40 (SV40) .
  • the early and late promoters of SV40 virus are particularly useful because both are obtained easily from the virus as a fragment that also contains the SV40 viral origin of replication (Fiers et al. , Nature. 273: 113 (1978)).
  • Smaller or larger SV40 fragments are also suitably used, provided there is included the approximately 250-bp sequence extending from the Hindi11 site toward the Bgll site located in the viral origin of replication.
  • promoter or control sequences normally associated with the desired gene sequence provided such control sequences are compatible with the host cell systems.
  • An origin of replication typically is provided either by construction of the vector to include an exogenous origin, such as may be derived from SV40 or other viral (e.g., Polyoma, Adeno, VSV, BPV) source, or by the host cell chromosomal replication mechanism. If the vector is integrated into the host cell chromosome, the latter is often sufficient.
  • an exogenous origin such as may be derived from SV40 or other viral (e.g., Polyoma, Adeno, VSV, BPV) source, or by the host cell chromosomal replication mechanism. If the vector is integrated into the host cell chromosome, the latter is often sufficient.
  • the secondary coding sequence comprises dihydrofolate reductase (DHFR) that is affected by an externally controlled parameter, such as methotrexate (MTX) , thus permitting control of expression by control of the MTX concentration.
  • DHFR dihydrofolate reductase
  • MTX methotrexate
  • a preferred host cell for transfection by the vectors of the invention that comprise DNA sequences encoding both the target polypeptide and DHFR protein it is appropriate to consider the type of DHFR protein employed. If wild-type DHFR protein is employed, it is preferable to select a host cell that is deficient in DHFR, thus permitting the use of the DHFR coding sequence as a marker for successful transfection in selective medium that lacks hypoxanthine, glycine, and thymidine.
  • DHFR protein with low binding affinity for MTX is used as the controlling sequence, it is not necessary to use DHFR-deficient cells. Because the mutant DHFR is resistant to MTX, MTX-containing media can be used as a means of selection, provided that the host cells are themselves MTX sensitive. Most eukaryotic cells that are capable of absorbing MTX appear to be sensitive to MTX.
  • One such useful cell line is a CHO line, CHO-K1 (ATCC No. CCL 61) .
  • transfection generally is carried out by the calcium phosphate precipitation method as described by Graham and Van der Eb, Virology. 52 : 546 (1978) .
  • other methods for introducing DNA into cells such as nuclear injection, electroporation, or protoplast fusion are also suitably used.
  • yeast are used as the host, transfection is generally accomplished using polyethylene glycol, as taught by Hinnen, Proc. Natl. Acad. Sci. U.S.A., 25: 1929-1933 (1978) .
  • the preferred method of transfection is calcium treatment using calcium as described by Cohen et al. , Proc. Natl. Acad. Sci. (USA) £9: 2110 (1972) , or more recently electroporation.
  • Plasmid DNA fragments are cleaved, tailored, and religated in the form desired to form the plasmids required.
  • Cleavage is performed by treating with restriction enzyme (or enzymes) in suitable buffer.
  • restriction enzyme or enzymes
  • suitable buffer In general, about 1 ⁇ g plasmid or DNA fragments is used with about 1 unit of enzyme in about 20 ⁇ l of buffers and substrate amounts for particular restriction enzymes are specified by the manufacturer.) Incubation times of about one hour at 37°C are workable. After incubation, protein is removed by extraction with phenol and chloroform, and the nucleic acid is recovered from the aqueous fraction by precipitation with ethanol.
  • the preparation may be treated for 15 minutes at 15°C with 10 units of the Klenow fragment of DNA Polymerase I (Klenow) , phenol-chloroform extracted, and ethanol precipitated.
  • Klenow Klenow fragment of DNA Polymerase I
  • Size separation of the cleaved fragments is performed using 6 percent polyacrylamide gel described by Goeddel et al., Nucleic Acids Res.. 8.: 4057 (1980) .
  • approximately equimolar amounts of the desired components are treated with about 10 units T4 DNA ligase per 0.5 ⁇ g DNA.
  • T4 DNA ligase per 0.5 ⁇ g DNA.
  • the ligation mixtures are typically used to transform E__ coli K12 (ATCC 31,446) or other suitable J . coli strains, and successful transformants selected by ampicillin or tetracycline resistance where appropriate. Plasmids from the transformants are prepared and analyzed by restriction mapping and/or DNA sequencing by the method of Messing et al., Nucleic Acids Res.. S_ : 309 (1981) or by the method of Maxam et al . , Methods of Enzvmoloqy, 65 : 499 (1980) .
  • amplification of DHFR-protein-coding sequences is effected by growing host cell cultures in the presence of approximately 20,000-500,000 nM concentrations of MTX, a competitive inhibitor of DHFR activity.
  • concentrations of MTX a competitive inhibitor of DHFR activity.
  • concentrations of MTX are highly dependent, of course, upon the nature of the DHFR gene and protein and the characteristics of the host. Clearly, generally defined upper and lower limits cannot be ascertained. Suitable concentrations of other folic acid analogs or other compounds that inhibit DHFR could also be used.
  • MTX itself is, however, convenient, readily available, and effective.
  • bispecific immunoadhesins can be purified to a degree suitable for therapeutic applications.
  • the actual therapeutic use will depend on the functionalities of any particular bispecific immunoadhesin.
  • (CD4 x anti-CD3) bispecific molecules have already been discussed, and further details will be provided hereinafter.
  • (CD4 x anti-CD16) bispecific immunoadhesins are expected to have a similar therapeutic utility.
  • TNFR-IgG x anti-endotoxin antibody (TNFR x anti- endotoxin) immunoadhesins can, for example, be used for the prevention or treatment of endotoxic shock.
  • Bispecific immunoadhesins having the antigen binding site specific for fibrin linked to a protein comprising the active portion of a plasminogen activator, such as streptokinase, urokinase, prourokinase or t-PA, are useful as immunotherapeutics.
  • a plasminogen activator such as streptokinase, urokinase, prourokinase or t-PA
  • bispecific immunoadhesins combine the lymph node binding function of L-selectin and the HIV binding function of CD . Because this bispecific molecule binds to endothelial tissue not only in lymph nodes but in secondary lymphoid organis such as Peyer's patches and in the brain, it may be used for delivery of CD4-IgG across the blood-brain barrier for the treatment of HIV-related dementia.
  • the bispecific immunoadhesins are combined with a pharmaceutically acceptable carrier.
  • a pharmaceutically acceptable carrier are well known in the art and are disclosed, for example, in Remington's Pharmaceutical Sciences, 16th Edition, 1980, Mac Publishing Company.
  • the determination of the therapeutically efficient concentration for any desired bispecific immunoadhesin is well within the skill of an ordinary artisan.
  • the selection of a preferred pharmaceutical formulation and the determination of the therapeutically efficient dose regimen are facilitated by information available for the two functionalities when used as therapeutics alone or in the form of a monospecific immunoadhesin.
  • the bispecific immunoadhesins are expected to be efficacious at lower concentrations than the respective proteins from which their binding domains are derived.
  • the bispecific immunoadhesins of the present invention may, for example, be placed into sterile, isotonic formulations together with required cofactors.
  • the formulation is preferably liquid or may be lyophilized powder.
  • the (CD4 x anti-CD3) bispecific immunoadhesins can, for example, be diluted with a formulation buffer comprising 5.0 mg/ml citric acid monohydrate, 2.7 mg/m trisodium citrate, 41 mg/ml mannitol, 1 mg/ml glycine and 1 mg/ml polysorbate 20.
  • This solution can be lyophilized, stored under refrigeration and reconstitued prior to administration with sterile Water-For-Injection (USP) .
  • USP Water-For-Injection
  • the bispecific immunoadhesins may also be administered via microspheres, liposomes, other microparticulate delivery systems or sustained release formulations placed in certain tissues including blood.
  • sustained release carriers include semipermeable polymer matrices in the form of shaped articles, e.g. suppositories, or microcapsules.
  • Implantable or microcapsular sustained release matrices include polylactides (U.S. Patent No. 3,773,919; EP 58,481), copolymers of L-glutamic acid and gamma ethyl-L-glutamate [Sidman et al . , Biopolvmers 22 (1) .
  • Liposomes containing the bispecific immunoadhesins can be prepared by well known methods: DE 3,218,121; Epstein et al . , Proc. Natl. Acad. Sci. USA 82. 3688-3692 (1985); Hwang et al . , Proc. Natl. Acad. Sci. USA 77, 4030-4034 (1980) ; EP 52322; EP 36676; EP 88046; EP 143,949; EP 142,541; U.S. Patents Nos. 4,485,045 and 4,544,545. Ordinarily the liposomes are of the small (about 200-800 Angstroms) unilamellar type in which the lipid content is greater than about 30 mol. % cholesterol, the selected proportion being adjusted for the optimal rate of the polypeptide leakage.
  • bispecific immunoadhesins of the present invention may be advantageous to attach to liposomes containing toxins or various therapeutic agents.
  • (CD4 x anti-CD3) bispecific immunoadhesins can be covalently linked to liposomes comprising toxins or agents which can inhibit HIV replication [Matsukura et al . , Proc. Natl. Acad. Sci. USA 8 , 4244-4248 (1989)] .
  • the bispecific immunoadhesins inhibit the interaction of HIV with the CD4 receptor and target the toxins or anti-HIV agents to HIV infected cells, whereas their anti-CD3 arm is instrumental in activating the cytotoxic T lymphocytes, thereby recruiting the cellular immune response for fighting HIV infection.
  • the attachment of the bispecific immunoadhesins to liposomes may be performed by any known cross-linking agent, such as heterobifunctional cross- linking agents that have been widely used for their regiospecificity in coupling toxins or chemotherapeutics to antibodies for targeted delivery.
  • Bispecific immunoadhesins can be used also as diagnostic tools where one arm of the bispecific molecule is a targeting arm, and the other is a reporting arm (directly or detected by a reporter molecule) .
  • the CD4 arm is capable of targeting a (CD4 x anti-CD3) bispecific immunoadhesin to HIV-infected cells, whereas the anti-CD3 portion can be used for detection.
  • the bispecific immunoadhesins combining plasminogen activator and fibrin-binding functionalities may be used in immunodiagnostic applications, including in vivo immunodiagnosis, by detectably labeling the bispecific molecule with a radionuclide.
  • the DNA sequences encoding the two immunoglobulin heavy chains are inserted in separate vectors and are cotransfected into a suitable host organism.
  • This provides for great flexibility in adjusting the mutual proportions of the three polypeptide fragments in embodiments when unequal ratios of the three polypeptide chains used in the construction provide the optimum yields. It is, however, possible to insert the coding sequences for two or all three polypeptide chains in one expression vector when the expression of at least two polypeptide chains in equal ratios results in high yields or when the ratios are of no particular significance.
  • the bispecific immunoadhesins of the present invention comprise an amino acid sequence specifically binding to a foreign antigen on the surface of a target cell, and preferably to an integral viral protein of a retrovirus, preferably HIV.
  • the binding site preferably is within the gp 160, gp 120, gp 41 region of the major envelope glycoprotein of HIV, including the gp 120/gp 41 complex.
  • the HIV-binding domain preferably is a CD4 amino acid sequence.
  • the amino acid sequence of the native CD4 molecules is known [Maddon et al . , Cell 42. 93 (1985); WO 88/01304 published 25 February 1988] .
  • Several approaches have been used to define the amino acids within the VI region of the CD4 amino acid sequence to which the gp 120 of the HIV virus binds .
  • transmembrane and cytoplasmic regions are not required for the gp 120 binding of CD4, these domains may be deleted to provide a soluble CD4 molecule. Usually at least residues 368 to 395 (the transmembrane domain) , and frequently also residues 396 to 433 (the cytoplasmic domain) are deleted.
  • CD4 Insertional variants of CD4 were, for example, published by Mizukami et al . , Proc. Natl. Acad. SciT USA 85, 9273
  • CD4 amino acid sequence variants and covalent derivatives are, for example, disclosed in WO 89/02922 published 6 April 1989.
  • an amino acid can be inserted adjacent to, deleted from, or substituted for an amino acid of CD4 at positions corresponding to position 7, 15, 17, 21, 22, 23, 28, 29, 30, 32, 35, 36, 37, 39, 40, 44, 45, 46, 49, 51, 52, 53, 54, 57, 58, 59, 62, 63, 64, 75, 77, 78, 79, 80, 81, 82, 85, 87, 89, 91, or 94 of the native CD4 amino acid sequence.
  • Ashkenazi et al . Proc. Natl. Acad. Sci.
  • Immunoadhesins comprising the fusion of CD4 with immunoglobulin sequences of IgG or IgM subtype are known in the art [Byrn, R.A. , 1990, supra; Capon, D.J., 1989, supra; Traunecker, A., Nature 339, 68-70 (1989)], and are disclosed in WO 89/02922 published 6 April 1989; and EP 314,317, supra.
  • Cell lines producing mouse anti-human CD3 antibodies, including their antigen recognition and binding sites are known in the art and are, for example, disclosed in Berg et al . , supra; Traunecker et al .
  • the (CD4 x anti-CD3) bispecific immunoadhesins of the present invention can be made following gneral procedures disclosed in WO 89/02922 (disclosing CD4-Ig immunoadhesins) and WO 91/08298 published 13 June 1991 (disclosing immunoadhesins comprising adhesons that are not members of the immunoglobulin gene superfamily) .
  • the CD4-anti-CD3 bispecific immunoadhesins herein are constructed by transfecting mammalian cells with plasmids encoding, individually, human CD4-IgG (preferably IgG-1 or IgG-3) , humanized mouse anti-CD3 ⁇ l or ⁇ 3 heavy chain, and humanized mouse anti-CD3 kappa light chain.
  • Cells transfected in this way produce and assemble these polypeptides in three oligomeric combinations: (i) a heterotetramer of two IgG heavy and two IgG light chains, which contains two binding sites for CD3; (ii) a homodimer of two CD4-IgG fusion proteins, which contains two binding sites for gd 120; and (iii) a heterotrimer of one IgG light chain, one IgG heavy chain and one CD4-IgG, which contains one binding site for CD3 and one for gp 120 (the bispecific immunoadhesin) .
  • the foregoing three products are preferably isolated from the cell culture supernatants by affinity chromatography based on their Fc portion.
  • the isolation is preferably performed on a Protein A Sepharose chromatographic column which binds Fc-bearing proteins.
  • the proteins comprising a CD4 portion may be separated from the anti-CD3 heterotetramer by immunoaffinity chromatography using an immobilized anti-CD4 monoclonal antibody.
  • the bispecific (CD4 x anti-CD3) molecule can be removed by affinity chromatography based on its light chain portion, using an immobilized anti-human kappa IgG polyclonal antibody. If desired, any of the separation/isolation steps may be repeated.
  • the isolated bispecific immunoadhesin may be further purified by known techniques, such as ion exchange chromatography.
  • the CD4 portion-based and immunoglobulin light chain- based separation steps can also be performed in a reverse order, first separating the two immunoglobulin light chain- bearing products from the CD4-IgG homodimer, and subsequently isolating the (CD4 X anti-CD3) bispecific immunoadhesin from the anti-CD3-Ig homotetramer (composed of two heavy chain- light chain pairs) , based on its CD4 portion.
  • the purified (CD4 x anti-CD3) bispecific immunoadhesins are formulated into conventional pharmaceutical formulation using pharmacologically acceptable excipients [see Remington's Pharmaceutical Sciences 16th Ed. 1980, Mac Publishing Company] .
  • the preferred formulation is liophilized powder, which may be diluted with a liquid diluent, preferably sterile water to any desired stock concentration. Dilutions suitable for intravenous administration may be made with conventional formulations buffers and/or stabilizers immediately prior to administration.
  • the CD4 x anti-CD3 antibody bispecific immunoadhesins are administered to patients at high risk of or having HIV infection at a dosage capable of activating a CTL response against HIV-infected cells, but not uninfected cells. These bispecific immunoadhesins are particularly suitable for the prevention of the establishment of HIV infection in an uninfected individual that has been or is at risk to be exposed to HIV, or in a recently infected individual in which the HIV infection is still limited to a relatively small number of cells.
  • bispecific (CD4 x anti-CD3) immunoadhesins constructed with an IgG heavy chain are expected to cross the human placenta similarly to IgG immunoglobulins and CD4-IgG immunoadhesins, they are particularly suitable for the prevention of maternal/fetal transmission of HIV infection.
  • the bispecific immunoadhesin is preferably administered to HIV seropositive women at the onset of labor, more preferably about one to two weeks before the labor and at the onset of labor.
  • the (CD4 x anti-CD3) bispecific immunoadhesin can also be administered to the infants postnatally.
  • the preferred route of administration is injection or intravenous infusion, and the ordinary dosage is about 1 mg/kg to about 6 mg/kg i.v. bolus.
  • This administration is expected to reduce the load of HIV in the mother prior to birth and thus the risk of transmission.
  • transfer of the bispecific immunoadhesin to the fetus or postnatal administration to the infant can provide CTL-mediated protection for the newborn baby.
  • the CD4-Ig x L-selectin-Ig (CD4 x L-selectin) bispecific immunoadhesins represent a different strategy for the prevention or treatment of HIV infection.
  • the selectins are unified structurally by the inclusion of lectin, egf-like and complement binding-like domains, and functionally by their ability to mediate cell binding through interactions between their lectin domains and cell surface carbohydrate ligands.
  • peripheral lymph node homing receptor pnHR
  • LEC-CAM-1 LEC-CAM-1, LAM- 1, gpgo" 11 ', gpl00 MEL , gpllOTM 11 , MEL antigen, Leu-8 antigen, TQ-1 antigen, DREG antigen
  • E-selectin LEC-CAM-27 ⁇ LECAM-2, ELAM- 1
  • P-selectin LEC-CAM-3, LECAM-3, GPM-140, PADGEM
  • bispecific immunoadhesins combine the lymph node homing ability of L- selectin with the ability of CD4 to bind HIV. By targeting the CD4 molecules to the lymph nodes these bispecific molecules can provide high local concentrations of CD4 at a location where HIV infection is most widespread.
  • the L-selectin portion of the (CD4 x L-selectin) bispecific immunoadhesin molecule may be native-sequence L- selectin as disclosed in U.S. patent No. 5,098,833, supra or any fragment or derivative thereof retaining the qualitative lymph node binding function of native L-selectin. Such derivatives are disclosed in the cited U. S. patent, and preferably are encoded by a DNA sequence capable of hybridizing, under stringent conditions, with the lectin domain of L-selectin. Immunoadhesins comprising the fusion of an L-selectin sequence with an immunoglobulin constant domain sequence are disclosed in U. S. patent No. 5,116,964 issued 26 May 1992.
  • an N-terminal portion of an L- selectin (referred to as LHR) , which contains the binding site for the endothelium of lymphoid tissue, is fused to the C-terminal Fc portion of an immunoglobulin.
  • LHR L- selectin
  • the entire heavy chain constant region of an IgG immunoglobulin is fused to a portion of the L-selectin molecule.
  • a sequence beginning in the hinge region just upstream of the papain cleavage site which defines IgG Fc chemically (residue 216, taking the first rresidue of heavy chain constant region to be 114 (Kabat et al . , supra) .
  • the (CD4 x L- selectin) bispecific immunoadhesins is designed to have a heterotrimeric structure as hereinabove described.
  • Such heterotrimers are composed of a CD4-immunoglobulin heavy chain constant domain fusion protein in one arm, and an L- selectin-immunoglobulin heavy chain constant domain sequence associated with an immunoglobulin light chain, in the other arm.
  • These asymmetic bispecific molecules can be prepared and purified essentially as described for (CD4 x anti-CD3) bispecific immunoadhesins.
  • the present bispecific immunoadhesin therapy can also be combined with other therapies useful for the prevention or treatment of HIV infection and related conditions, and in particular for slowing down the progression of the development of HIV infection.
  • Combination therapy may, for example, be performed by using a liposome drug delivery system.
  • bispecific immunoadhesins can be covalently linked to liposomes containing any toxin or drug.
  • the attachment of bispecific immunoadhesins designed for use in anti-HIV herapy to liposomes containing drugs with anti-HIV activity provides a new means of combination therapy.
  • For CD4 it has already been demonstrated that its linkage via its carbohydrate portion to a liposome does not interfere with its ability to bind HIV (see Duzgunes, N. et al . , supra) .
  • the CD4-IgG-l chimera was constructed as described in Byrn et al . , Nature 344, 667 (1990) . Briefly, this construct consists of residues 1-180 of the mature human CD4 protein fused to human IgG-1 sequences beginning at aspartic acid 216 (taking amino acid 114 as the first residue of the heavy chain constant region [Kabat et al . , supra] ) which is the first residue of the IgG-1 hinge after the cysteine residue involved in heavy-light chain bonding, and ending with residue 441.
  • This molecule contains the CD4 VI and V2 domains, linked to the hinge and Fc (CH2 and CH3) domains of human IgG-1, and is designated CD4 2 Fcl.
  • the construction of humanized anti-CD3 heavy chain and humanized anti-CD3 light chain is described in Shalaby et al . , J. Exp. Med. 175, 217
  • CD4-IgG-l CD4 2 Fcl
  • anti-CD3 heavy chain and anti- CD3 light chain expression vectors were introduced into human embryonic kidney 293S cells by transient transfection, using a modification of the calcium phosphate precipitation method [Gorman, C in DNA Cloning Vol. Ill (ed. Glover, D.M.), pp. 143-190, IRL, Oxford, 1985] .
  • the total amount of plasmid DNA transfected was 20 ⁇ g, and the amount of each individual plasmid was varied to assess the effect of the relative amounts of DNA on the relative amounts of the thee possible protein products.
  • the three plasmids encoding the CD4-IgG and the anti-CD3 heavy and light chain constructs were transfected in various combinations (total DNA amount of 20 ⁇ g) , and the amount of protein containing the immunoglobulin Fc region in serum-free supernatants from metabolically labeled, transfected cells was assessed by radioimmunoprecipitation with protein A (Pansorbin) (Figure 2) .
  • the product mixture obtained with the 60:20:20% plasmid ratio was treated as follows.
  • MAb 754 (5 mg) was immobilized onto controlled pore glass (1 mL) , equilibrated in 20 mM Tris pH 7.4, 150 mM NaCl, and Protein A pool (1 mg) was loaded. Unbound material was washed out with the same buffer, and material non-specifically bound to the matrix was washed out with 20 mM Tris pH 7.4, 150 mM NaCl, 0.5 M tetramethylammonium chloride (TMAC) . Bound protein was elute with 50 mM Tris pH 7.4, 3.5 M MgCl 2 .
  • the mAb 754 column was cycled 11 types to produce a total of 4.8 mg of the trimeric (CD4 x anti-CD3) bispecific protein. Affinity chromatography based on kappa light chain To recover the (CD4 x anti-CD3) heterotrimer free of the CD4-IgG homodimer, the mAb 754 pool was loaded onto a second immunoaffinity column, this one specific for human kappa chain. A polyclonal anti-human kappa IgG (3 mg, Sigma K- 3502) was immobilized onto controlled pore glass (1 mL) , equilibrated, loaded (0.5 mL) and washed as described above for mAb 754.
  • bound, purified bispecific immunoadhesin was eluted with 50 mM citric acid pH 3.0, 20% (w/v) glycerol, and neutralized as before.
  • the column was cycled 6 times to produce a total of 0.83 mg of the (CD4 x anti-CD3) heterotrimer.
  • CEM Human T cell lines CEM, HIV-I IIIB chronically infected (CEM/IIIB) or uninfected (CEM) , were cultured in RPMI 1640 medium (JRH Biosciences, Lenexa,KS) supplemented with 10% heat-inactivated fetal calf serum (growth medium, GM) . About 95% of cells express HIV-1 gpl20 by immunofluorescence assay with anti-HIV-1 serum. CEM is
  • the bifunctional immunoadhesin was prepared by coexpressing human anti-CD3 antibody with CD4-IgG immunoadhesin [Byrn, R.A. et al., Nature 334:667-670 (1990)] as described in Example 1.
  • the human monoclonal antibody, F105 was provided by Dr. Marshall Posner, New England Deaconess Hospital [Posner, M.R. et al . , J. Immunol . 146:4325-4332 (1991)] .
  • This IgGl antibody reacts with HIV-1 gpl20 and blocks the binding of gpl20 to CD4.
  • Peripheral blood lymphocytes were isolated from blood from normal donors by standard Ficoll- Hypaque gradient centrifugation and maintained in GM as described [Junghans, R.P. et al., Cancer Immunol. Immunother. 21:207-212 (1990)] .
  • PBL stimulated with interleukin 2 (IL-2) were cultured in the presence of 1000 U/ml affinity-purified human recombinant IL-2 (Hoffmann-LaRoche, Inc.) for 14-16 hours.
  • Human cytotoxic lymphocytes were a gift of Dr. John Yanelli (NCI, Bethesda) , and were prepared and activated according to standard procedures [Yannelli, J.R. et al . , J. Immunol. Methods 139:1-16 (1991)] .
  • ECR Effector cell retargeting
  • HIV-1 infected and uninfected cells HIV-1 IIIB infected and uninfected CEM and monocyte cell line U937 were used as targets.
  • the results showed that HIV-1 infected CEM cells were lysed to a great extent with the bispecific immunoadhesin and with a control anti-gpl20 antibody (F105) while uninfected cells showed no lysis (Fig. 2) .
  • the same results were observed with U937. Because the U937 cell line was much more sensitive to NK killing, causing higher backgrounds, it was not studied further (not shown) . However, the pattern of killing with these antibodies differed with different effector cells.
  • PBLs killed infected target cells in the presence of F105, or bispecific immunoadhesin, while CTL killed infected cells only in the presence of bispecific immunoadhesin and not with F105.
  • PBLs mediated target cell lysis was generally enhanced when PBLs were stimulated with IL-2.
  • bispecific immunoadhesin dose-dependent target cell lysis and its concentration curve To test the most effective concentration of (CD4 x anti-CD3) bispecific immunoadhesin, we titrated the effects of different concentrations for mediating target cell lysis by PBL and CTL. As shown in Fig. 4, target cell lysis increased with higher bispecific immunoadhesin concentration until l ⁇ g/ml, and slightly decreased or plateaued with higher concentrations. (CD4 x anti-CD3) bispecific immunoadhesin concentrations showed the same optimum in the presence of 50% human serum with PBL or CTL (not shown) .
  • Target cell killings by F105 also showed a plateau in the l ⁇ g/ml range for PBL +IL-2 or -IL-2, and was not active in 50% human serum even at 10 ⁇ g/ml final concentration (not shown) . These l ⁇ g/ml concentrations were used for both antibodies in the studies of Figures 2 and 3._

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Abstract

L'invention concerne la préparation et la purification jusqu'à homogénéité d'immunoadhésines bispécifiques. Ces composés bispécifiques sont caractérisés par une structure hétérotrimère de type immunoglobuline, composée d'une chaîne lourde d'immunoglobulines portant une première spécificité et d'un couple chaîne lourde-chaîne légère d'immunoglobulines portant une deuxième spécificité.
PCT/US1993/007783 1992-08-17 1993-08-17 Immunoadhesines bispecifiques Ceased WO1994004690A1 (fr)

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EP0656064B1 (fr) 1997-03-05
AU5080193A (en) 1994-03-15
JPH08500017A (ja) 1996-01-09
DE69308573T2 (de) 1997-08-07
EP0656064A1 (fr) 1995-06-07
DE69308573D1 (de) 1997-04-10
AU668423B2 (en) 1996-05-02
CA2140280A1 (fr) 1994-03-03
ATE149570T1 (de) 1997-03-15

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